Neutrinos are sub-atomic particles that are able to pass through solid matter. Right now, as you read this, billions and billions of neutrinos which emanated from the Sun are passing through your body, and this is true even if you are reading this at night because these neutrinos actually pass through the solid earth before they pass through you.
Neutrinos are similar to electrons except neutrinos carry no charge. Consequently, they are unaffected by the electromagnetic forces that affect electrons. Being subatomic, they pass through the largely empty space of an atom. Neutrinos are created as a byproduct of nuclear reactions and nuclear decay, so the sun being a gigantic fusion reactor streams trillions of these particles every second through the planet and through you.
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